<?php
/**
* Django's templating engine (partial) PHP implementation.
* provides some template tags support
* @link http://djangoproject.com
* this file is from a webappkit package (kit)
* @link http://webappkit.net
* @package djtpl
* @author J.Ducastel <jeremie@ducastel.name>
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*/

/**
* 'firstof' tag. Renders first of vars which is not null/false
* <code>{% firstof var1 var2 var3 %}</code>
*/
class djtplTagNode_firstOf extends djtplTagNode {

	/**
	* builds itself from tokens
	* @param djangoTplToken &$selfToken
	* @param array &$nextTokens djangoTplToken
	* @access public
	* @return bool
	*/
	function buildFromTokens(&$selfToken) {
		$def=$selfToken->tagdef;
		$this->vars=explode(' ',$def);
		return true;
	}/**/

	/**
	* is the node atomic (has no children)
	* @access public
	* @return bool
	*/
	function isAtomic() {
		return true;
	}/**/
	
	/**
	* renders as string
	* @param djangoTplContext &$context
	* @access public
	* @return string
	*/
	function render(&$context) {
		foreach ($this->vars as $var) {
			if ($value=$context->getPath($var))
				return strval($value);
		}
		return '';
	}/**/
	
	var $tagname='firstof';
}
?>
